2009 5.3 1500 rough idle when cold starts for approximately 30-45 seconds

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G-932682

my 2009 sierra 1500 with 5.3 idles rough at cold start then smooths out after 30-45 seconds. any ideas that would cause this
 

98trck

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i know its not a GMC But, it makes me wonder
a friend had a BMW that a cold start, rough idle n smoke out the tail pipe
he fought with the dealer then they kept it overnight
so they could do a cold start, there was some injectors going bad
so the dealer replaced all the injectors
car ran great after that

PETE
 
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